<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>bootstrap</title>
    <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
    <script src="jquery/jquery-3.3.1.js"></script>
    <script src="bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
    <div class="input-group">
        <span class="input-group-addon">$</span>
        <input type="text" class="form-control">
    </div>
</body>
</html>